package cn.tedu.v3;

import com.sun.xml.internal.ws.policy.privateutil.PolicyUtils;

import java.io.*;
import java.net.BindException;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.Scanner;

/**
 *Version 3.0 升级双向链接【客户端与服务器相互说话】
 *
 * 优化空间:代码结构、流没有关闭
 */

public class Server {

    private ServerSocket serverSocket;

    public Server() {
        try {
            serverSocket=new ServerSocket(4545);
        } catch (BindException e){
            System.out.println("端口号重复创建，建议换个端口号");
        }catch (IOException e) {
            System.out.println("申请端口号失败....");
        }
    }

    public void start() {

        try {
            while(true) {

                System.out.println("----等待客户端链接-----");
                Socket socket = serverSocket.accept();
                String ip = socket.getInetAddress().getHostAddress();
                System.out.println(ip + "客户端链接成功了");


              new Thread(new CS(socket)).start();

            }
        } catch (IOException e) {
            System.out.println("服务器端通讯断开了");
        } finally {
             if(serverSocket!=null&&serverSocket.isClosed()){
                 try {
                     serverSocket.close();
                 } catch (IOException e) {
                     System.out.println("服务器关闭失败");
                 }
             }
        }
    }




    public static void main(String[] args) throws IOException {
         new Server().start();

    }

    private class CS implements Runnable {
    private Socket socket;
        private String ip;
        public CS(Socket s){
            this.socket=s;
             ip = socket.getInetAddress().getHostAddress();
        }

        public void run() {
            PrintWriter pw=null;
//            BufferedReader br=null;
            try {
                //1.读入定义
                BufferedReader br = new BufferedReader(new InputStreamReader(socket.getInputStream(), "UTF8"));
                //2.定义写出
                pw=new PrintWriter(new BufferedWriter(new OutputStreamWriter(socket.getOutputStream(),"UTF8")),true);
                //1.1读入功能：存线程中
                new Thread(()->{
                    try {
                        String message;
                        while((message=br.readLine())!=null){
                            System.out.println("客户端说："+message);
                            //增加写出一句话：读完卡住等待输入
                            System.out.println("服务器端请输入");
                        }
                    }catch (IOException e){
                        System.out.println("客户端读入失败");
                    }
                }).start();
               //2.1 提供写方法：控制台输入
                Scanner input =new Scanner(System.in);//后台卡住
                while (true) {
                    System.out.println("服务器请输入：");
                    String say=input.nextLine();//得到控制台输入值
                    //打印：服务器端说的内容文本---打印客户端
                    pw.println("服务器说："+say);
                }
            } catch (NullPointerException e){
                System.out.println("IO流传入对象，" +
                        "有对象为null！立马核对，" +
                        "建议：查看try块中对象可能赋值为null");
            } catch (UnsupportedEncodingException e) {
                System.out.println("客户端或者服务器端：字符集不一致");
            } catch (IOException e) {
                System.out.println("通讯过程中，传输出现错误！");
            } finally {
//                if(br!=null)
//                    try {
//                       br.close();
//                    } catch (IOException e) {
//                        System.out.println("结束通讯：关闭失败！");
//                    }
                if(socket!=null&&socket.isClosed())
                    try {
                        socket.close();
                    } catch (IOException e) {
                        System.out.println("通讯关闭失败~");
                    }

            }
        }
    }
}
